Are these the official NEET questions on Thermal Properties of Matter?

Yes. They are the questions NTA set in each paper, in its wording. The solutions are written by BrainIt.

Thermal Properties of Matter NEET PYQs with Solutions (2020 to 2026) PDF

The questions come from Re-NEET 2026 and NEET 2020. Each shows its answer and solution when you open it, so you can attempt it first. For what the chapter covers and how NEET tests it, see the Thermal Properties of Matter guide.

Practise on the CBT screen2 questions, 2 minutes, marked +4 / −1 Download PDF2 pages, 0.7 MB, with answers and solutions

Re-NEET 2026 · the full paper

Re-NEET 2026 · Q24
The temperature of a metallic sphere of radius $R$ is increased by a small amount $\Delta T$ . If the linear coefficient of thermal expansion of the metal is $\alpha$ , the approximate increase in the volume of the sphere is:
1. (1)
  $2\pi R^3\alpha\Delta T$
2. (2)
  $3\pi R^3\alpha\Delta T$
3. (3)
  $4\pi R^3\alpha\Delta T$
4. (4)
  $6\pi R^3\alpha\Delta T$
Answer and solution
Answer: (3)
For small expansions the coefficient of volume expansion is $\gamma = 3\alpha$ . Hence $\Delta V = V\gamma\Delta T = \frac{4}{3}\pi R^3 \times 3\alpha \times \Delta T = 4\pi R^3\alpha\Delta T$ . Equivalently, differentiating $V = \frac{4}{3}\pi R^3$ gives $\Delta V = 4\pi R^2 \Delta R$ with $\Delta R = R\alpha\Delta T$ . NCERT Class 11, Thermal Properties of Matter.

NEET 2020 · the full paper

NEET 2020 · Q155
The quantities of heat required to raise the temperature of two solid copper spheres of radii r $_{1}$ and r $_{2}$ (r $_{1}$ = 1.5r $_{2}$ ) through 1 K are in the ratio
1. (1)
  9/4
2. (2)
  3/2
3. (3)
  5/3
4. (4)
  27/8
Answer and solution
Answer: (4)
The heat required to raise the temperature of a sphere is proportional to its volume, which is proportional to the cube of its radius. Given $r_1 = 1.5 r_2$ , the ratio of volumes is $\left(\frac{r_1}{r_2}\right)^3 = \left(\frac{1.5 r_2}{r_2}\right)^3 = 1.5^3 = \frac{27}{8}$ . Therefore, the ratio of the quantities of heat required is $\frac{27}{8}$ . Chapter: Thermal Properties of Matter.

Practise Thermal Properties of Matter in the app: it brings back the questions you get wrong, so the chapter improves, not just your memory of these. Or try the free CBT mock. All chapters: NEET chapter-wise PYQs.

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Thermal Properties of Matter: NEET previous year questions

Re-NEET 2026 · the full paper

NEET 2020 · the full paper

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